/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package utils;

import org.hibernate.Session;
import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.SessionFactory;

/**
 * Hibernate Utility class with a convenient method to get Session Factory
 * object.
 *
 * @author Rashith
 */
public class SessionFactoryUtil {

    private static final SessionFactory sessionFactory;
    
    static {
        try {
            // Create the SessionFactory from standard (hibernate.cfg.xml) 
            // config file.
            sessionFactory = new AnnotationConfiguration().configure().buildSessionFactory();
        } catch (Throwable ex) {
            // Log the exception. 
            System.err.println("Initial SessionFactory creation failed." + ex);
            throw new ExceptionInInitializerError(ex);
        }
    }
    
    public static SessionFactory getSessionFactory() {
        return sessionFactory;
    }
    
    /**
    * Opens a session and will not bind it to a session context
    * @return the session
    */
    public Session openSession() {
        return sessionFactory.openSession();
    }

    /**
    * Returns a session from the session context. 
    * If there is no session in the context it opens a session,
    * stores it in the context and returns it.
    * This factory is intended to be used with a hibernate.cfg.xml
    * including the following property <property
    * name="current_session_context_class">thread</property> 
    * This would return
    * the current open session or if this does not exist, will create a new
    * session
    *
    * @return the session
    */
    public Session getCurrentSession() {
        return sessionFactory.getCurrentSession();
    }

    /**
    * closes the session factory
    */
    public static void close(){
        if (sessionFactory != null)
            sessionFactory.close();
    }

}
